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| author | Sebastian Reichel <sre@kernel.org> | 2016-04-30 17:11:54 +0200 |
|---|---|---|
| committer | Sebastian Reichel <sre@kernel.org> | 2016-06-28 00:38:47 +0200 |
| commit | 2083057aacecbd79ed73670763f07e6e7c1acd66 (patch) | |
| tree | 92608f1337e83e95c3ae3c60145e24b253d2b57f | |
| parent | cb70e4c1bc96604953f5792f71ba9ba104705154 (diff) | |
| download | linux-exynos-2083057aacecbd79ed73670763f07e6e7c1acd66.tar.gz linux-exynos-2083057aacecbd79ed73670763f07e6e7c1acd66.tar.bz2 linux-exynos-2083057aacecbd79ed73670763f07e6e7c1acd66.zip | |
HSI: omap_ssi_port: replace wkin_cken with atomic bitmap operations
This simplifies the code and avoids holding a spin_lock when
runtime pm calls are made. Once the irq_safe flag is removed
for omap_ssi's runtime pm, pm_runtime_get/put_sync can sleep,
which is a no-go while holding a spin_lock.
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Tested-by: Pavel Machek <pavel@ucw.cz>
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi.h | 6 | ||||
| -rw-r--r-- | drivers/hsi/controllers/omap_ssi_port.c | 16 |
2 files changed, 7 insertions, 15 deletions
diff --git a/drivers/hsi/controllers/omap_ssi.h b/drivers/hsi/controllers/omap_ssi.h index 88a523902a8f..6cdaad8805f7 100644 --- a/drivers/hsi/controllers/omap_ssi.h +++ b/drivers/hsi/controllers/omap_ssi.h @@ -35,6 +35,8 @@ #define SSI_MAX_GDD_LCH 8 #define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) +#define SSI_WAKE_EN 0 + /** * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context * @mode: Bit transmission mode @@ -75,7 +77,7 @@ struct omap_ssm_ctx { * @wake_irq: IRQ number for incoming wake line (-1 if none) * @wake_gpio: GPIO number for incoming wake line (-1 if none) * @pio_tasklet: Bottom half for PIO transfers and events - * @wkin_cken: Keep track of clock references due to the incoming wake line + * @flags: flags to keep track of states * @wk_refcount: Reference count for output wake line * @sys_mpu_enable: Context for the interrupt enable register for irq 0 * @sst: Context for the synchronous serial transmitter @@ -99,7 +101,7 @@ struct omap_ssi_port { struct gpio_desc *wake_gpio; struct tasklet_struct pio_tasklet; bool wktest:1; /* FIXME: HACK to be removed */ - bool wkin_cken:1; /* Workaround */ + unsigned long flags; unsigned int wk_refcount; /* OMAP SSI port context */ u32 sys_mpu_enable; /* We use only one irq */ diff --git a/drivers/hsi/controllers/omap_ssi_port.c b/drivers/hsi/controllers/omap_ssi_port.c index 9001b06312c3..0d3452393670 100644 --- a/drivers/hsi/controllers/omap_ssi_port.c +++ b/drivers/hsi/controllers/omap_ssi_port.c @@ -751,10 +751,8 @@ static int ssi_release(struct hsi_client *cl) * Drop the clock reference for the incoming wake line * if it is still kept high by the other side. */ - if (omap_port->wkin_cken) { + if (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags)) pm_runtime_put_sync(omap_port->pdev); - omap_port->wkin_cken = 0; - } pm_runtime_get_sync(omap_port->pdev); /* Stop any SSI TX/RX without a client */ ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); @@ -981,12 +979,8 @@ static irqreturn_t ssi_wake_thread(int irq __maybe_unused, void *ssi_port) * This workaround will avoid breaking the clock reference * count when such a situation ocurrs. */ - spin_lock(&omap_port->lock); - if (!omap_port->wkin_cken) { - omap_port->wkin_cken = 1; + if (!test_and_set_bit(SSI_WAKE_EN, &omap_port->flags)) pm_runtime_get_sync(omap_port->pdev); - } - spin_unlock(&omap_port->lock); dev_dbg(&ssi->device, "Wake in high\n"); if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ writel(SSI_WAKE(0), @@ -1000,12 +994,8 @@ static irqreturn_t ssi_wake_thread(int irq __maybe_unused, void *ssi_port) omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); } hsi_event(port, HSI_EVENT_STOP_RX); - spin_lock(&omap_port->lock); - if (omap_port->wkin_cken) { + if (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags)) pm_runtime_put_sync(omap_port->pdev); - omap_port->wkin_cken = 0; - } - spin_unlock(&omap_port->lock); } return IRQ_HANDLED; |